Performance Analysis of AF Relays with Maximal Ratio Combining in Nakagami-m Fading Environments

Performance Analysis of AF Relays with Maximal Ratio Combining in Nakagami-m Fading Environments
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Nakagami-m 衰落环境中最大比组合 AF 继电器的性能分析

DOI:
10.1155/2019/1613690
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发表时间:
2019-02
影响因子:
--
通讯作者:
Zhou Tianqing
Zhou Tianqing
中科院分区:
计算机科学4区
文献类型:
--
作者:
Qin Dong;Wang Yuhao;Zhou Tianqing

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研究了Nakagami-m衰落环境下放大转发中继系统的最大比合并(MRC)性能。该研究考虑了以下三个链路,源到中继链路,源到目的地链路和中继到目的地链路具有不同的m衰落参数的一般情况。我们推导出新的封闭形式的重要性能指标,包括矩生成函数,中断概率,高阶矩的等效信噪比(SNR),遍历容量,和平均符号错误概率(SEP)的常见调制类型的统计表达式。特别是,我们专注于分析SEP表达式的上下文中的加性白色广义高斯噪声(AWGGN)。广义噪声作为一个比较活跃的研究领域,由于其模型的灵活性而受到广泛关注。然而,分析性能的调制方案在广义噪声型尚未发现在公开文献中AF中继与MRC尽管其实际用途。在没有解析解的情况下,广义噪声中的SEP只能通过大量重复的仿真实验来获得。因此,我们利用特殊的Fox H函数给出了SEP的一般表达式。仿真结果验证了理论分析的正确性,并表明MRC准则的分集阶数与三个链路的Nakagami参数呈线性关系。
This paper investigates the maximal ratio combining (MRC) performance of an amplify and forward (AF) relay system in Nakagami-m fading environments. The study considers a general scenario with distinct m fading parameters for the following three links, source to relay link, and source to destination link and relay to destination link. We derive new closed form expressions for the statistics of important performance metrics, including the moment generating function, outage probability, higher order moments of equivalent signal to noise ratio (SNR), ergodic capacity, and average symbol error probability (SEP) of common modulation types. In particular, we focus on analytical SEP expressions in the context of an additive white generalized Gaussian noise (AWGGN). As an active area of research, generalized noise receives much attention for its flexible model. However, analytical performance of modulation scheme in generalized noise type has not been found in open literature for AF relaying with MRC despite its practical usefulness. Without the help of analytical solutions, the SEP in generalized noise can only be obtained by a large number of repeated simulation experiments. Therefore, we present the general SEP expression by using special Fox’s H function. Simulation results verify the accuracy of our theoretical analysis and show that the diversity order of MRC criterion linearly depends upon Nakagami parameters of three links.
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